Can high-efficiency filters without partitions be made into H13, H14 and ULPA grades?
1. Efficiency grade range of high-efficiency filters without partitions
The partition-less high-efficiency filter uses ultra-fine glass fiber filter paper as the core filter material. The filter material is separated by hot melt glue lines to form a dense pleated structure. It is one of the most widely used filter types in the clean industry. Its efficiency levels range from HEPA levels H13 and H14 to ULPA levels U15, U16 and U17, and can be adapted to a variety of application scenarios from general industrial clean rooms to advanced semiconductor processes.
According to the European standard EN 1822, high-efficiency air filters (EPA, HEPA and ULPA) are classified according to MPPS (most penetrating particle size) efficiency. HEPA grade covers H13 and H14 levels; ULPA grade covers U15, U16 and U17 levels. The partition-less structure can stably achieve all the above-mentioned efficiency levels through precise folding processes and strict quality control.
2. Classification of HEPA and ULPA efficiency levels
According to the EN 1822 standard, the efficiency levels and corresponding parameters of high-efficiency filters without partitions are as follows:
grade
type
MPPS overall efficiency
local penetration
Applicable cleanliness level
Typical application scenarios
H13
HEPA
≥99.95%
≤0.25%
ISO 7-8 (level 10,000-level 100,000)
Electronic assembly, food processing, general industrial clean room
Nanoscale manufacturing, cutting-edge scientific research
The local penetration rate of H13 is allowed to be 0.25%, while that of H14 is only allowed to be 0.025% - the ten-fold difference determines that H14 must be scanned one by one to detect leaks. The ULPA level further improves the filtering accuracy on this basis.
3. How to achieve multiple efficiency levels in a partition-less structure
The reason why the partitionless high-efficiency filter can cover the complete efficiency level from H13 to U17 is mainly due to the following design and process features:
(1) Classification and selection of filter materials
Different efficiency levels correspond to different filter material specifications. H13 and H14 use HEPA grade ultra-fine glass fiber filter paper, while U15 and above use higher precision ULPA grade filter material. The fiber diameter, grammage and density of the filter media are matched to the target efficiency class.
(2) Hot melt adhesive line separation process
The partitionless filter uses hot melt glue lines to fold the filter material into a dense pleated structure. The spacing and shape of the glue lines have been optimized to ensure uniform air flow channels, ensuring filtration efficiency while controlling air resistance within a reasonable range.
(3) Multiple sealing guarantees
The seal between the frame and the filter material directly determines the overall efficiency of the filter. The baffleless filter is multi-sealed with polyurethane (PU) sealant to ensure no bypass leakage. Each unit undergoes a unit-by-unit scanning leak detection test (MPPS method) before leaving the factory, and a test report is provided.
(4) Compact structure and strong adaptability
The partition-less design is compact and lightweight, and is especially suitable for equipment with limited space such as FFU and EFU. Even at the ULPA level (U15-U17), it can still maintain a small overall size and meet the installation needs of various types of clean equipment.
4. The core differences between H13, H14 and ULPA
(1) Differences in filtering accuracy
The filtration efficiency of H13 for 0.3μm particles is not less than 99.95%, H14 is not less than 99.995%, and the filtration efficiency of ULPA U15 and above grades can reach more than 99.9995% for the particle size range of 0.1-0.2μm. From H13 to U17, the filtering accuracy is gradually improved by about two orders of magnitude.
(2) Test particle sizes are different
The test of HEPA grade (H13-H14) focuses on the particle size of 0.3μm; the test of ULPA grade (U15-U17) focuses on the particle size of 0.1-0.2μm (MPPS). ULPA conducts efficiency ratings for smaller particle sizes.
(3) Differentiation of application scenarios
H13 is suitable for ISO class 7-8 clean rooms, H14 is suitable for ISO class 5-6 clean rooms, and ULPA U15 and above are used for high-cleanliness environments of ISO class 4 and above. The higher the cleanliness requirements, the higher the required efficiency level.
(4) Differences in cost and resistance
The higher the efficiency level, the greater the cost and manufacturing difficulty of the filter material, and the initial resistance increases accordingly. The initial resistance of H13 is usually ≤220Pa, and the initial resistance of H14 and ULPA is slightly increased. When selecting, a comprehensive trade-off must be made between cleanliness requirements, system air volume and budget.
5. How to choose the efficiency level according to your needs
To select the efficiency grade of a high-efficiency filter without partitions, it is recommended to follow the following steps:
Step 1: Determine the cleanliness level
Clarify the required cleanliness level for the production environment according to the ISO 14644-1 standard. ISO 7-8 levels require H13, ISO 5-6 levels require H14, and ISO levels 4 and above require ULPA (U15 and above).
Step 2: Refer to industry standards
Different industries have clear requirements: the medical and pharmaceutical industries usually require H14 level; advanced semiconductor processes recommend U15 level or above; food and general industry H13 level is sufficient.
Step Three: Assess System Conditions
Confirm whether the fan pressure head of the FFU or air conditioning system is sufficient to overcome the initial resistance of the selected filter. The resistance of high-grade filters is slightly higher, so it is necessary to ensure that the system has sufficient margin.
Step 4: Request the test report
Each qualified high-efficiency filter without partitions should be accompanied by a scanning leak detection test report one by one when it leaves the factory, and it can only be accepted after confirming that the efficiency reaches the standard.
6. Product features of Aili industrial partitionless high-efficiency filter
Aili Industry has the following characteristics in the field of high-efficiency filters without partitions:
Independent production of the entire industry chain
Aili Industry has been deeply involved in the field of purification equipment for more than 20 years, and has built a closed loop of the entire industrial chain from fan research and development, control system development to high-efficiency filter production. The key components required for FFU—including EC DC fans, intelligent control systems, and HEPA/ULPA high-efficiency filters—are independently developed, produced, and tested by the company.
Strictly follow international standards
The partitionless high-efficiency filters produced by Aili Industries strictly comply with the EN 1822 standard, and the products cover the full series of H13, H14, U15, U16, and U17.
Unit-by-unit testing and quality traceability
Each partitionless high-efficiency filter undergoes strict scanning and leak detection testing before leaving the factory, and a test report is provided. The quality is traceable and meets the requirements for filter verifiability in pharmaceutical, semiconductor and other industries.
Pay equal attention to material selection and craftsmanship
It uses high-quality ultra-fine glass fiber filter paper and a precise hot-melt adhesive folding process to ensure high efficiency while maintaining low air resistance. The frame can be made of aluminum alloy, galvanized steel plate or stainless steel to adapt to different installation environments.
Customized support
Aili Industry supports personalized customization from air volume, size specifications to installation methods. Whether it is standard FFU matching or special size requirements, adaptation solutions can be provided.
7. Suggestions for selection
Cleanliness level
Recommended filter levels
Remark
ISO 7-8 (level 10,000-level 100,000)
H13
Economical and applicable, meeting general cleaning needs
ISO 5-6 (level 100-level 1,000)
H14
Pharmaceutical GMP, operating rooms and other key places
ISO 4-5 (Level 10-Level 100)
U15
Semiconductor backend, precision manufacturing
ISO level 3
U16
Chip lithography and other core areas
ISO level 1-2
U17
Nanoscale manufacturing, cutting-edge scientific research
If you want to know more about the selection details of high-efficiency filters without partitions, you can contact the Aili industrial engineering technical team to get selection suggestions for specific application scenarios.
HEPA installation should be carried out according to the airflow direction and installation drawing confirmed on site: first check the filter and frame, then clean the installation surface, press the seal evenly, and finally verify the air volume and seal under specified operating conditions.
When it is found that the HEPA installation direction is inconsistent with the product or box identification, the acceptance of this position should be suspended, the supplier's drawings and airflow arrows should be checked, and then adjusted according to the allowed installation method. Just because the filter fits into the frame doesn't mean the orientation is correct.
When purchasing HEPA, you should at least clarify the outer frame size, efficiency level and applicable standards, rated air volume, resistance, structure, sealing method, use environment and testing data requirements. The old filter element replacement project also requires installation frame and disassembly and assembly path information.
Differences in high-efficiency filter quotations may come from efficiency levels, filter materials, structural dimensions, resistance requirements, sealing methods, detection range and order quantity. When comparing prices, you should first confirm whether each quotation corresponds to the same technical conditions.
The installation quality of the liquid tank high-efficiency filter directly affects the sealing effect and cleanliness. Before installation, it is necessary to check that the appearance of the filter is not deformed or damaged, that the liquid tank is intact, and that the box knife edge is flat and free of burrs. During installation, pay attention to controlling the injection amount of sealant to 70%-80% of the depth of the liquid tank, and inject glue evenly and continuously along the periphery of the liquid tank. The filter must be vertically embedded in the knife edge and pushed into place; after installation, it is recommended to conduct a visual inspection, a PAO leak test and an initial resistance record. Common problems include sealant overflow (too much glue), insufficient sealant (too little glue), difficulty in pushing the filter (skew or size mismatch), and PAO leak detection frame leakage (insufficient insertion depth or missing glue). Aili industrial liquid tank high-efficiency filter is provided with polyurethane sealant and installation guidance materials, and the engineering technical team can provide installation technical guidance support.
The liquid tank high-efficiency filter and the ordinary non-partition high-efficiency filter belong to the non-partition filter category. The core difference lies in the frame structure and sealing method. The liquid tank filter frame has a liquid tank groove, and liquid sealant is injected to achieve sealing. The sealant flows and fills all irregular gaps. It has high long-term reliability and is suitable for ISO class 5 and above clean rooms. Ordinary filters without partitions are sealed by sealing tape extrusion, with a simple structure and low cost, and are suitable for ISO class 5 and below scenarios. The filtration area of the liquid tank filter of the same size is slightly smaller (about 5%-10% less), the price is higher, and the replacement operation is cleaner. When selecting, a comprehensive judgment must be made based on the cleanliness level, leak detection requirements, replacement frequency and budget. Aili Industrial produces two types of filters at the same time, with efficiency levels covering H13, H14 and U15-U17. Each unit has been tested and a test report has been issued.
The liquid tank high-efficiency filter and the ordinary non-partition high-efficiency filter belong to the non-partition filter category. The core difference lies in the frame structure and sealing method. The liquid tank filter frame has a liquid tank groove, and liquid sealant is injected to achieve sealing. The sealant flows and fills all irregular gaps. It has high long-term reliability and is suitable for ISO class 5 and above clean rooms. Ordinary filters without partitions are sealed by sealing tape extrusion, with a simple structure and low cost, and are suitable for ISO class 5 and below scenarios. The filtration area of the liquid tank filter of the same size is slightly smaller (about 5%-10% less), the price is higher, and the replacement operation is cleaner. When selecting, a comprehensive judgment must be made based on the cleanliness level, leak detection requirements, replacement frequency and budget. Aili Industrial produces two types of filters at the same time, with efficiency levels covering H13, H14 and U15-U17. Each unit has been tested and a test report has been issued.
V-type high-efficiency filter can reach H13 and H14 levels of EN1822:2009 standard. The total MPPS efficiency of H13 is ≥99.95%, and the local penetration rate is ≤0.25%; the total MPPS efficiency of H14 is ≥99.995%, and the local penetration rate is ≤0.025%. H13 is suitable for ISO7-8 clean rooms, electronic assembly, food processing and other scenarios; H14 is suitable for ISO5-6 clean rooms, pharmaceutical GMP, hospital operating rooms, semiconductor manufacturing and other key places. The V-shaped filter is designed with a V-shaped structure and can achieve large air volume carrying and controllable resistance in both H13 and H14 grades. When selecting, a comprehensive judgment must be made based on cleanliness level requirements, industry specifications and system air volume. Aili industrial V-type high-efficiency filters strictly comply with the EN1822 standard, and the efficiency levels cover H13 and H14. H14-level products are scanned and tested for leaks one by one, and test reports are provided.
The initial resistance is the pressure difference value of the new V-type high-efficiency filter under the rated air volume, in Pa, which is the basic parameter for selection, operation and maintenance. The initial resistance of V-type filter H13 grade is usually ≤200Pa, and the initial resistance of H14 grade is usually ≤250Pa. Under the same conditions, the resistance of H14 is slightly higher than H13. The initial resistance is used for fan head calculation and energy consumption assessment during selection, and is used as a basis for replacement judgment during operation - the final resistance is usually set to twice the initial resistance. When the actual measured initial resistance is too high, you need to check whether the actual air volume matches the rated air volume, and check whether the installation is standardized. Initial resistance is an important parameter affecting operating costs. Aili industrial V-type high-efficiency filter is designed with low resistance. The initial resistance of H13 is ≤200Pa, and the initial resistance of H14 is ≤250Pa. Each unit has been tested for resistance and a test report has been issued.
V-type high-efficiency filters are suitable for both constant air volume (CAV) and variable air volume (VAV) HVAC systems. The air volume of the CAV system is constant and the working conditions are stable. The V-shaped filter can take advantage of low resistance and high efficiency when selected according to the designed air volume. The air volume of the VAV system is dynamically adjusted as the load changes. The V-shaped filter has a strong structure and good adaptability to wide wind speeds. The wind speed can reach 2.5m/s under the initial resistance condition of 250Pa, adapting to wind speed fluctuation conditions. When selecting the VAV system, the maximum design air volume should be used as the basis, and a 20%-30% fan pressure head margin should be reserved. It is also recommended to configure a differential pressure transmitter to monitor the resistance in real time. V-type filter efficiency grade (H13/H14) does not affect the adaptability of the air volume system. Aili Industrial V-type high-efficiency filter has a solid structure, rated air volume covering 2400-4200m³/h, and is suitable for CAV and VAV systems. Each unit has been scanned and tested for leaks one by one and a test report has been issued.
The selection of large air volume V-type high-efficiency filter requires comprehensive consideration of four core parameters: rated air volume, overall size, initial resistance and efficiency level. Common specifications include rated air volume covering 850-4200m³/h, external dimensions ranging from 287×592×292mm to 1220×610×292mm, and initial resistance as low as ≤200Pa. The selection steps include calculating the total air volume of the system, determining the air volume requirement of a single unit, selecting the overall dimensions according to the parameter table, checking the installation space (especially the depth direction, the standard is 292mm), selecting the efficiency level (H13 or H14), checking the initial resistance and evaluating the replacement cycle. It is recommended to reserve 10%-20% air volume margin when selecting a model to avoid neglecting the depth size, the impact of efficiency level on air volume, and the difference between initial resistance and final resistance. Aili Industrial provides a variety of dimensions and V-shaped configurations, with rated air volume covering 850-4200m³/h. It strictly complies with the EN1822 standard. Each unit has been scanned and tested for leaks one by one and a test report has been issued.
The V-type high-efficiency filter is arranged in a V-shape with multiple filter elements without partitions, which increases the filtration area to 3-5 times that of ordinary flat-plate filters under the same external dimensions. Its core principle is to expand the filter material from a two-dimensional plane to a three-dimensional space, making full use of the depth direction of the frame. The increased filtration area brings practical advantages such as low resistance (initial resistance can be as low as ≤200Pa), large air volume (rated air volume can reach 2400-4200m³/h), high dust holding capacity and reduced number of filters. V-type filters are suitable for large air volume scenarios in limited spaces such as the end of air-conditioning boxes, compact HVAC systems, return air ducts in clean factories, and upgrades of existing systems. When selecting, you need to confirm the installation depth, select a V-shaped configuration according to the air volume, and check the system resistance. Aili industrial V-type high-efficiency filters strictly comply with the EN1822 standard and are available in 3V, 4V, and 5V specifications. Each unit has been scanned and tested for leaks one by one and a test report has been issued.
V-Bank high-efficiency filter (V-type combined high-efficiency filter) uses multiple filter elements without partitions to form a V-shaped structure. The rated air volume can reach 2400-4200m³/h. It is suitable for constant air volume (CAV) and variable air volume (VAV) HVAC systems. Typical application scenarios include hospital operating rooms and ICUs, pharmaceutical GMP workshops, electronic and semiconductor clean workshops, food processing plants, data centers, hotels and schools and other commercial buildings, as well as industrial ventilation facilities such as power plants. V-Bank filters can be used as high-efficiency filtration or ULPA pre-protection at the end of air conditioning boxes in HVAC systems. They have technical advantages such as large air volume carrying capacity, low operating resistance, high dust holding capacity, and saving installation space. Aili Industrial V-Bank high-efficiency filters strictly comply with EN1822 standards, with efficiency levels covering H13 and H14, adapting to the needs of various HVAC air treatment systems. Each unit has been scanned and tested for leaks one by one and a test report has been issued.
The V-type partitionless high-efficiency filter uses multiple partition-less filter elements to form a V-shaped structure. The filtration area can reach 3-5 times that of ordinary filters, the rated air volume can reach 2400-4200m³/h, and the initial resistance can be as low as ≤200Pa. In large air volume systems, compared with ordinary high-efficiency filters, V-type filters have the advantages of reducing the number of filters, saving installation space, reducing installation costs, reducing operating energy consumption, and extending the replacement cycle. The efficiency level covers H13 and H14, and is suitable for large air volume scenarios such as terminal filtration of air-conditioning boxes, electronic semiconductors, pharmaceuticals and medical care, and power plants. When selecting, you need to pay attention to parameters such as rated air volume, initial resistance, efficiency level, and overall dimensions. Aili Industrial V-type partitionless high-efficiency filter strictly complies with the EN1822 standard and provides large air volume design, low resistance and high dust holding capacity, optional multi-material frames and unit-by-unit inspection services.
The V-type high-efficiency filter (V-Bank) uses multiple filter elements without partitions to form a V-shaped structure. The filtration area can reach 3-5 times that of ordinary filters. The designed air volume is more than 2 times higher than that of high-efficiency filters with partitions. The initial resistance can be as low as ≤200Pa. Compared with ordinary high-efficiency filters, V-type filters require fewer installations, smaller installation space, lower operating resistance, higher dust holding capacity and longer service life under the same air volume. The efficiency level covers H13 and H14, and is mainly used in scenarios such as terminal filtration of air-conditioning boxes, large air volume HVAC systems, electronic semiconductors, pharmaceuticals, medical and power plants. Aili industrial V-type high-efficiency filters strictly comply with the EN1822 standard, provide multiple specifications and are tested one by one, and support customized production.
The thickness (50mm, 70mm, 90mm, 120mm) and filter area of the high-efficiency filter without partitions directly affect the air volume carrying capacity, initial pressure difference, dust holding capacity and service life. 70mm is the standard configuration of FFU, which strikes a balance between space occupation and performance; 90mm and 120mm are suitable for equipment with ample space such as air-conditioning boxes, with larger filter area and longer replacement cycle. When selecting, a comprehensive judgment must be made based on the size of the installation space, system air volume, fan head margin and full life cycle cost. If space allows, choosing a thicker filter, lower energy consumption and longer replacement intervals can usually pay back the cost difference within 1-2 years. Aili Industrial provides multiple thickness specifications of 50-120mm and non-standard customization services. Each unit is scanned and tested for leaks one by one and a test report is issued. The engineering and technical team can assist in air volume calculation and resistance calculation.
The partition-less high-efficiency filter uses ultra-fine glass fiber filter paper and hot-melt adhesive line separation technology, and can cover the full range of efficiency levels of H13, H14 and ULPA U15, U16, and U17. According to the EN1822 standard, H13 efficiency ≥ 99.95%, H14 ≥ 99.995%, U15 ≥ 99.9995%, U16 ≥ 99.99995%, U17 ≥ 99.999995%. Different levels correspond to different cleanliness requirements - H13 is suitable for ISO 7-8 clean rooms, H14 is suitable for ISO 5-6 clean rooms, and the local penetration rates of H13 and H14 differ by ten times. ULPA conducts efficiency assessments in the particle size range of 0.1-0.2μm and is suitable for high cleanliness environments of ISO level 4 and above. When selecting a model, a comprehensive balance must be made based on the cleanliness level, industry standards, system air volume and budget. Aili Industrial has independent production capabilities throughout the industry chain and strictly follows the EN1822 standard. Each filter is scanned and tested for leaks one by one and a test report is provided. It supports full series customization of H13, H14 and U15-U17.
When the installation space of FFU, EFU, clean shed or other clean equipment is limited, high-efficiency filters without partitions can be considered. The partition-less structure uses glue lines to fix the fold distance of the filter material, and has a certain design space in terms of filter thickness, filter area and internal structure. The actual selection should not only focus on the thickness of the filter, but also need to comprehensively consider the filtration efficiency, target air volume, initial resistance, fan static pressure, sealing method and later replacement space. Aili Industry can match the specifications of high-efficiency filters without partitions based on the equipment installation dimensions and operating parameters.
Partitionless high-efficiency filters can be used in clean environments such as semiconductors, electronic manufacturing, photovoltaics, pharmaceuticals, laboratories and precision manufacturing according to different specifications, and are often used in conjunction with FFU, EFU, clean sheds and clean room terminal air supply equipment. Different applications have different requirements for filtration efficiency, air volume, resistance, size, thickness and sealing methods, so selection needs to be based on specific equipment and clean environments. Aili Industry can match the specifications of high-efficiency filters without partitions based on industry applications, equipment structures and project parameters.
High-efficiency filters without partitions usually adopt filter material folding, glue line separation and outer frame sealing structure, without using traditional paper partitions or aluminum partitions. Its specifications mainly include overall dimensions, thickness, filtration efficiency, air volume, initial resistance, outer frame material and sealing method, etc. When used in FFU, EFU, clean sheds and clean room terminal air supply equipment, it needs to be matched based on the installation space, fan performance and target air volume. Aili Industry can provide corresponding specifications and configurations of high-efficiency filters without partitions based on equipment size, air volume, filtration efficiency and usage environment.
Aili Industrial develops and manufactures
FFU, EFU, HEPA/ULPA air filters, high-efficiency air supply vents, fan boxes and other clean air equipment. Relying on motors, fans, control systems, filters and complete machine supporting capabilities, we provide selection and customization support for clean room and production equipment projects.
